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Finite element analyses of the stability of a soil block reinforced by shear pins
Ouch, Rithy,Ukritchon, Boonchai,Pipatpongsa, Thirapong,Khosravi, Mohammad Hossein Techno-Press 2017 Geomechanics & engineering Vol.12 No.6
The assessment of slope stability is an essential task in geotechnical engineering. In this paper, a three-dimensional (3D) finite element analysis (FEA) was employed to investigate the performance of different shear pin arrangements to increase the stability of a soil block resting on an inclined plane with a low-interface friction plane. In the numerical models, the soil block was modeled by volume elements with linear elastic perfectly plastic material in a drained condition, while the shear pins were modeled by volume elements with linear elastic material. Interface elements were used along the bedding plane (bedding interface element) and around the shear pins (shear pin interface element) to simulate the soil-structure interaction. Bedding interface elements were used to capture the shear sliding of the soil on the low-interface friction plane while shear pin interface elements were used to model the shear bonding of the soil around the pins. A failure analysis was performed by means of the gravity loading method. The results of the 3D FEA with the numerical models were compared to those with the physical models for all cases. The effects of the number of shear pins, the shear pin locations, the different shear pin arrangements, the thickness and the width of the soil block and the associated failure mechanisms were discussed.
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Boonchai Ukritchon,Rithy Ouch,Thirapong Pipatpongsa,Mohammad Hossein Khosravi 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.5
Slope failures along a bedding plane were critical issues and mostly happened in an open pit mining project such as the Mae MohMine, Thailand. The prediction of maximum width to maintain stable slope after an excavation process is required. This paperpresents an investigation of 3D finite element analysis for the stability and failure mechanism of undercut slopes resting on a lowinterface friction plane. In numerical models, the soil slope was modeled as volume elements with the hardening soil material. Interface elements were used at the bottom plane to simulate the low interface friction plane and at the side support to simulate fullyrough surface for the models with side supports. Stage analyses in numerical models were performed following excavation processesin physical models until failure. The effects of the side support and the slope length to increase the stability of undercut slopes wereconsidered. Failure widths, failure mechanisms, and stress distributions associated with slope angles and boundary conditions of sidesupport were discussed and compared.
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